The "!" line only affects tests in that file.
This amends
c6d4380c.
Thanks to Kornel for spotting this.
# Exception: ja knitr.lyx and sweave.lyx support only XeLaTeX with system fonts
# because they use the "bxjsarticle" class.
#
-# The "!" means "Protect these tests from being matched by future patterns".
+# The "!" means the following:
+# "Protect these tests from being matched by future patterns in this file".
!export/.*/ja/(knitr|sweave).*_(lyx.*|xhtml|pdf4_systemF)
export/.*/ja/(knitr|sweave).*
#